Node database: collect nodes during sync, expose GET /api/nodes (#7)

src/mesh/codec.ts

@@ -10,6 +10,8 @@ async function loadProto(): Promise<typeof import('@meshtastic/protobufs')> {
 export const BROADCAST_ADDR = 0xffffffff;
 // official portnums.proto: TEXT_MESSAGE_APP=1 (task spec draft said 3 — the enum value wins)
 export const PORT_TEXT_MESSAGE_APP = 1;
+// verified against installed @meshtastic/protobufs Portnums.PortNum.POSITION_APP
+export const PORT_POSITION_APP = 3;
 
 const START1 = 0x94;
 const START2 = 0xc3;
@@ -61,6 +63,29 @@ export async function decodeFromRadio(
   return fromBinary(P.Mesh.FromRadioSchema, bytes);
 }
 
+/** POSITION_APP packets carry a serialized meshtastic.Position in Data.payload. */
+export async function decodePosition(
+  bytes: Uint8Array,
+): Promise<import('@meshtastic/protobufs').Mesh.Position> {
+  const P = await loadProto();
+  return fromBinary(P.Mesh.PositionSchema, bytes);
+}
+
+let hwModelNames: Map<number, string> | null = null;
+/** Reverse lookup of meshtastic.HardwareModel (enum value -> name), loaded once. */
+export async function loadHwModelNames(): Promise<Map<number, string>> {
+  if (!hwModelNames) {
+    const P = await loadProto();
+    hwModelNames = new Map(
+      Object.entries(P.Mesh.HardwareModel).map(([k, v]) => [
+        Number(k),
+        String(v),
+      ]),
+    );
+  }
+  return hwModelNames;
+}
+
 export async function buildTextToRadio(
   to: number,
   text: string,